// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "ui/gfx/geometry/vector2d_f.h"

#include <cmath>

#include "base/strings/stringprintf.h"

namespace gfx {

std::string Vector2dF::ToString() const
{
    return base::StringPrintf("[%f %f]", x_, y_);
}

bool Vector2dF::IsZero() const
{
    return x_ == 0 && y_ == 0;
}

void Vector2dF::Add(const Vector2dF& other)
{
    x_ += other.x_;
    y_ += other.y_;
}

void Vector2dF::Subtract(const Vector2dF& other)
{
    x_ -= other.x_;
    y_ -= other.y_;
}

double Vector2dF::LengthSquared() const
{
    return static_cast<double>(x_) * x_ + static_cast<double>(y_) * y_;
}

float Vector2dF::Length() const
{
    return static_cast<float>(std::sqrt(LengthSquared()));
}

void Vector2dF::Scale(float x_scale, float y_scale)
{
    x_ *= x_scale;
    y_ *= y_scale;
}

double CrossProduct(const Vector2dF& lhs, const Vector2dF& rhs)
{
    return static_cast<double>(lhs.x()) * rhs.y() - static_cast<double>(lhs.y()) * rhs.x();
}

double DotProduct(const Vector2dF& lhs, const Vector2dF& rhs)
{
    return static_cast<double>(lhs.x()) * rhs.x() + static_cast<double>(lhs.y()) * rhs.y();
}

Vector2dF ScaleVector2d(const Vector2dF& v, float x_scale, float y_scale)
{
    Vector2dF scaled_v(v);
    scaled_v.Scale(x_scale, y_scale);
    return scaled_v;
}

} // namespace gfx
